[IRGen] Remove unused ObjC selector-family-related code
[IRGen] Remove unused ObjC selector-family-related code

tjw/swift,alblue/swift,parkera/swift,hooman/swift,rudkx/swift,glessard/swift,danielmartin/swift,amraboelela/swift,xedin/swift,aschwaighofer/swift,CodaFi/swift,sschiau/swift,benlangmuir/swift,sschiau/swift,tkremenek/swift,airspeedswift/swift,parkera/swift,amraboelela/swift,brentdax/swift,xedin/swift,jmgc/swift,harlanhaskins/swift,atrick/swift,tkremenek/swift,gregomni/swift,jmgc/swift,roambotics/swift,natecook1000/swift,parkera/swift,airspeedswift/swift,gribozavr/swift,tkremenek/swift,gribozavr/swift,roambotics/swift,danielmartin/swift,roambotics/swift,jmgc/swift,jopamer/swift,airspeedswift/swift,tjw/swift,lorentey/swift,stephentyrone/swift,alblue/swift,harlanhaskins/swift,gregomni/swift,devincoughlin/swift,gregomni/swift,brentdax/swift,danielmartin/swift,danielmartin/swift,atrick/swift,harlanhaskins/swift,jmgc/swift,aschwaighofer/swift,airspeedswift/swift,brentdax/swift,huonw/swift,parkera/swift,apple/swift,jckarter/swift,aschwaighofer/swift,austinzheng/swift,parkera/swift,gribozavr/swift,practicalswift/swift,natecook1000/swift,atrick/swift,alblue/swift,nathawes/swift,jopamer/swift,amraboelela/swift,devincoughlin/swift,tjw/swift,jckarter/swift,sschiau/swift,karwa/swift,gregomni/swift,tjw/swift,atrick/swift,jopamer/swift,jckarter/swift,allevato/swift,hooman/swift,shajrawi/swift,xwu/swift,austinzheng/swift,lorentey/swift,practicalswift/swift,stephentyrone/swift,hooman/swift,aschwaighofer/swift,stephentyrone/swift,amraboelela/swift,natecook1000/swift,alblue/swift,lorentey/swift,karwa/swift,apple/swift,JGiola/swift,austinzheng/swift,aschwaighofer/swift,huonw/swift,xedin/swift,lorentey/swift,alblue/swift,glessard/swift,shahmishal/swift,glessard/swift,danielmartin/swift,karwa/swift,ahoppen/swift,gribozavr/swift,sschiau/swift,xwu/swift,lorentey/swift,gregomni/swift,danielmartin/swift,natecook1000/swift,gribozavr/swift,brentdax/swift,xedin/swift,karwa/swift,jckarter/swift,JGiola/swift,rudkx/swift,atrick/swift,JGiola/swift,karwa/swift,shajrawi/swift,xwu/swift,CodaFi/swift,JGiola/swift,rudkx/swift,huonw/swift,shajrawi/swift,tkremenek/swift,hooman/swift,brentdax/swift,sschiau/swift,tjw/swift,shajrawi/swift,devincoughlin/swift,gribozavr/swift,atrick/swift,jmgc/swift,apple/swift,natecook1000/swift,shahmishal/swift,practicalswift/swift,xwu/swift,CodaFi/swift,sschiau/swift,benlangmuir/swift,nathawes/swift,benlangmuir/swift,stephentyrone/swift,glessard/swift,harlanhaskins/swift,CodaFi/swift,harlanhaskins/swift,austinzheng/swift,shahmishal/swift,devincoughlin/swift,rudkx/swift,allevato/swift,huonw/swift,allevato/swift,nathawes/swift,jopamer/swift,shajrawi/swift,huonw/swift,parkera/swift,gregomni/swift,harlanhaskins/swift,devincoughlin/swift,shajrawi/swift,allevato/swift,brentdax/swift,huonw/swift,roambotics/swift,practicalswift/swift,shahmishal/swift,jckarter/swift,glessard/swift,jckarter/swift,apple/swift,JGiola/swift,amraboelela/swift,benlangmuir/swift,CodaFi/swift,JGiola/swift,natecook1000/swift,nathawes/swift,rudkx/swift,xedin/swift,jopamer/swift,tjw/swift,ahoppen/swift,shajrawi/swift,sschiau/swift,glessard/swift,austinzheng/swift,devincoughlin/swift,sschiau/swift,shahmishal/swift,tkremenek/swift,karwa/swift,xedin/swift,ahoppen/swift,ahoppen/swift,xedin/swift,nathawes/swift,stephentyrone/swift,devincoughlin/swift,jmgc/swift,stephentyrone/swift,tkremenek/swift,lorentey/swift,airspeedswift/swift,shahmishal/swift,ahoppen/swift,ahoppen/swift,austinzheng/swift,harlanhaskins/swift,hooman/swift,allevato/swift,practicalswift/swift,roambotics/swift,shajrawi/swift,aschwaighofer/swift,hooman/swift,huonw/swift,amraboelela/swift,allevato/swift,benlangmuir/swift,alblue/swift,xwu/swift,hooman/swift,practicalswift/swift,nathawes/swift,CodaFi/swift,brentdax/swift,CodaFi/swift,aschwaighofer/swift,parkera/swift,lorentey/swift,shahmishal/swift,apple/swift,lorentey/swift,rudkx/swift,karwa/swift,alblue/swift,gribozavr/swift,danielmartin/swift,xedin/swift,nathawes/swift,apple/swift,karwa/swift,xwu/swift,tjw/swift,benlangmuir/swift,amraboelela/swift,jopamer/swift,roambotics/swift,xwu/swift,allevato/swift,airspeedswift/swift,jckarter/swift,airspeedswift/swift,practicalswift/swift,gribozavr/swift,stephentyrone/swift,jopamer/swift,tkremenek/swift,jmgc/swift,parkera/swift,practicalswift/swift,natecook1000/swift,shahmishal/swift,austinzheng/swift,devincoughlin/swift